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path: root/target/linux/lantiq/patches-4.14/0090-spi-lantiq-ssc-add-support-for-Lantiq-SSC-SPI-contro.patch
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-rw-r--r--target/linux/lantiq/patches-4.14/0090-spi-lantiq-ssc-add-support-for-Lantiq-SSC-SPI-contro.patch1078
1 files changed, 0 insertions, 1078 deletions
diff --git a/target/linux/lantiq/patches-4.14/0090-spi-lantiq-ssc-add-support-for-Lantiq-SSC-SPI-contro.patch b/target/linux/lantiq/patches-4.14/0090-spi-lantiq-ssc-add-support-for-Lantiq-SSC-SPI-contro.patch
deleted file mode 100644
index da48ae3..0000000
--- a/target/linux/lantiq/patches-4.14/0090-spi-lantiq-ssc-add-support-for-Lantiq-SSC-SPI-contro.patch
+++ /dev/null
@@ -1,1078 +0,0 @@
-From 941ab0bc001fe24e5f8ce88eed27f2a1b89f3e20 Mon Sep 17 00:00:00 2001
-From: Hauke Mehrtens <hauke@hauke-m.de>
-Date: Tue, 14 Feb 2017 00:31:11 +0100
-Subject: spi: lantiq-ssc: add support for Lantiq SSC SPI controller
-
-This driver supports the Lantiq SSC SPI controller in master
-mode. This controller is found on Intel (former Lantiq) SoCs like
-the Danube, Falcon, xRX200, xRX300.
-
-The hardware uses two hardware FIFOs one for received and one for
-transferred bytes. When the driver writes data into the transmit FIFO
-the complete word is taken from the FIFO into a shift register. The
-data from this shift register is then written to the wire. This driver
-uses the interrupts signaling the status of the FIFOs and not the shift
-register. It is also possible to use the interrupts for the shift
-register, but they will send a signal after every word. When using the
-interrupts for the shift register we get a signal when the last word is
-written into the shift register and not when it is written to the wire.
-After all FIFOs are empty the driver busy waits till the hardware is
-not busy any more and returns the transfer status.
-
-Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
-Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
-Signed-off-by: Mark Brown <broonie@kernel.org>
----
- .../devicetree/bindings/spi/spi-lantiq-ssc.txt | 29 +
- drivers/spi/Kconfig | 8 +
- drivers/spi/Makefile | 1 +
- drivers/spi/spi-lantiq-ssc.c | 983 +++++++++++++++++++++
- 4 files changed, 1021 insertions(+)
- create mode 100644 Documentation/devicetree/bindings/spi/spi-lantiq-ssc.txt
- create mode 100644 drivers/spi/spi-lantiq-ssc.c
-
---- /dev/null
-+++ b/Documentation/devicetree/bindings/spi/spi-lantiq-ssc.txt
-@@ -0,0 +1,29 @@
-+Lantiq Synchronous Serial Controller (SSC) SPI master driver
-+
-+Required properties:
-+- compatible: "lantiq,ase-spi", "lantiq,falcon-spi", "lantiq,xrx100-spi"
-+- #address-cells: see spi-bus.txt
-+- #size-cells: see spi-bus.txt
-+- reg: address and length of the spi master registers
-+- interrupts: should contain the "spi_rx", "spi_tx" and "spi_err" interrupt.
-+
-+
-+Optional properties:
-+- clocks: spi clock phandle
-+- num-cs: see spi-bus.txt, set to 8 if unset
-+- base-cs: the number of the first chip select, set to 1 if unset.
-+
-+Example:
-+
-+
-+spi: spi@E100800 {
-+ compatible = "lantiq,xrx200-spi", "lantiq,xrx100-spi";
-+ reg = <0xE100800 0x100>;
-+ interrupt-parent = <&icu0>;
-+ interrupts = <22 23 24>;
-+ interrupt-names = "spi_rx", "spi_tx", "spi_err";
-+ #address-cells = <1>;
-+ #size-cells = <1>;
-+ num-cs = <6>;
-+ base-cs = <1>;
-+};
---- a/drivers/spi/Kconfig
-+++ b/drivers/spi/Kconfig
-@@ -403,6 +403,14 @@ config SPI_NUC900
- help
- SPI driver for Nuvoton NUC900 series ARM SoCs
-
-+config SPI_LANTIQ_SSC
-+ tristate "Lantiq SSC SPI controller"
-+ depends on LANTIQ
-+ help
-+ This driver supports the Lantiq SSC SPI controller in master
-+ mode. This controller is found on Intel (former Lantiq) SoCs like
-+ the Danube, Falcon, xRX200, xRX300.
-+
- config SPI_OC_TINY
- tristate "OpenCores tiny SPI"
- depends on GPIOLIB || COMPILE_TEST
---- a/drivers/spi/Makefile
-+++ b/drivers/spi/Makefile
-@@ -47,6 +47,7 @@ obj-$(CONFIG_SPI_FSL_SPI) += spi-fsl-sp
- obj-$(CONFIG_SPI_GPIO) += spi-gpio.o
- obj-$(CONFIG_SPI_IMG_SPFI) += spi-img-spfi.o
- obj-$(CONFIG_SPI_IMX) += spi-imx.o
-+obj-$(CONFIG_SPI_LANTIQ_SSC) += spi-lantiq-ssc.o
- obj-$(CONFIG_SPI_JCORE) += spi-jcore.o
- obj-$(CONFIG_SPI_LM70_LLP) += spi-lm70llp.o
- obj-$(CONFIG_SPI_LP8841_RTC) += spi-lp8841-rtc.o
---- /dev/null
-+++ b/drivers/spi/spi-lantiq-ssc.c
-@@ -0,0 +1,983 @@
-+/*
-+ * Copyright (C) 2011-2015 Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
-+ * Copyright (C) 2016 Hauke Mehrtens <hauke@hauke-m.de>
-+ *
-+ * This program is free software; you can distribute it and/or modify it
-+ * under the terms of the GNU General Public License (Version 2) as
-+ * published by the Free Software Foundation.
-+ */
-+
-+#include <linux/kernel.h>
-+#include <linux/module.h>
-+#include <linux/of_device.h>
-+#include <linux/clk.h>
-+#include <linux/io.h>
-+#include <linux/delay.h>
-+#include <linux/interrupt.h>
-+#include <linux/sched.h>
-+#include <linux/completion.h>
-+#include <linux/spinlock.h>
-+#include <linux/err.h>
-+#include <linux/gpio.h>
-+#include <linux/pm_runtime.h>
-+#include <linux/spi/spi.h>
-+
-+#ifdef CONFIG_LANTIQ
-+#include <lantiq_soc.h>
-+#endif
-+
-+#define SPI_RX_IRQ_NAME "spi_rx"
-+#define SPI_TX_IRQ_NAME "spi_tx"
-+#define SPI_ERR_IRQ_NAME "spi_err"
-+#define SPI_FRM_IRQ_NAME "spi_frm"
-+
-+#define SPI_CLC 0x00
-+#define SPI_PISEL 0x04
-+#define SPI_ID 0x08
-+#define SPI_CON 0x10
-+#define SPI_STAT 0x14
-+#define SPI_WHBSTATE 0x18
-+#define SPI_TB 0x20
-+#define SPI_RB 0x24
-+#define SPI_RXFCON 0x30
-+#define SPI_TXFCON 0x34
-+#define SPI_FSTAT 0x38
-+#define SPI_BRT 0x40
-+#define SPI_BRSTAT 0x44
-+#define SPI_SFCON 0x60
-+#define SPI_SFSTAT 0x64
-+#define SPI_GPOCON 0x70
-+#define SPI_GPOSTAT 0x74
-+#define SPI_FPGO 0x78
-+#define SPI_RXREQ 0x80
-+#define SPI_RXCNT 0x84
-+#define SPI_DMACON 0xec
-+#define SPI_IRNEN 0xf4
-+#define SPI_IRNICR 0xf8
-+#define SPI_IRNCR 0xfc
-+
-+#define SPI_CLC_SMC_S 16 /* Clock divider for sleep mode */
-+#define SPI_CLC_SMC_M (0xFF << SPI_CLC_SMC_S)
-+#define SPI_CLC_RMC_S 8 /* Clock divider for normal run mode */
-+#define SPI_CLC_RMC_M (0xFF << SPI_CLC_RMC_S)
-+#define SPI_CLC_DISS BIT(1) /* Disable status bit */
-+#define SPI_CLC_DISR BIT(0) /* Disable request bit */
-+
-+#define SPI_ID_TXFS_S 24 /* Implemented TX FIFO size */
-+#define SPI_ID_TXFS_M (0x3F << SPI_ID_TXFS_S)
-+#define SPI_ID_RXFS_S 16 /* Implemented RX FIFO size */
-+#define SPI_ID_RXFS_M (0x3F << SPI_ID_RXFS_S)
-+#define SPI_ID_MOD_S 8 /* Module ID */
-+#define SPI_ID_MOD_M (0xff << SPI_ID_MOD_S)
-+#define SPI_ID_CFG_S 5 /* DMA interface support */
-+#define SPI_ID_CFG_M (1 << SPI_ID_CFG_S)
-+#define SPI_ID_REV_M 0x1F /* Hardware revision number */
-+
-+#define SPI_CON_BM_S 16 /* Data width selection */
-+#define SPI_CON_BM_M (0x1F << SPI_CON_BM_S)
-+#define SPI_CON_EM BIT(24) /* Echo mode */
-+#define SPI_CON_IDLE BIT(23) /* Idle bit value */
-+#define SPI_CON_ENBV BIT(22) /* Enable byte valid control */
-+#define SPI_CON_RUEN BIT(12) /* Receive underflow error enable */
-+#define SPI_CON_TUEN BIT(11) /* Transmit underflow error enable */
-+#define SPI_CON_AEN BIT(10) /* Abort error enable */
-+#define SPI_CON_REN BIT(9) /* Receive overflow error enable */
-+#define SPI_CON_TEN BIT(8) /* Transmit overflow error enable */
-+#define SPI_CON_LB BIT(7) /* Loopback control */
-+#define SPI_CON_PO BIT(6) /* Clock polarity control */
-+#define SPI_CON_PH BIT(5) /* Clock phase control */
-+#define SPI_CON_HB BIT(4) /* Heading control */
-+#define SPI_CON_RXOFF BIT(1) /* Switch receiver off */
-+#define SPI_CON_TXOFF BIT(0) /* Switch transmitter off */
-+
-+#define SPI_STAT_RXBV_S 28
-+#define SPI_STAT_RXBV_M (0x7 << SPI_STAT_RXBV_S)
-+#define SPI_STAT_BSY BIT(13) /* Busy flag */
-+#define SPI_STAT_RUE BIT(12) /* Receive underflow error flag */
-+#define SPI_STAT_TUE BIT(11) /* Transmit underflow error flag */
-+#define SPI_STAT_AE BIT(10) /* Abort error flag */
-+#define SPI_STAT_RE BIT(9) /* Receive error flag */
-+#define SPI_STAT_TE BIT(8) /* Transmit error flag */
-+#define SPI_STAT_ME BIT(7) /* Mode error flag */
-+#define SPI_STAT_MS BIT(1) /* Master/slave select bit */
-+#define SPI_STAT_EN BIT(0) /* Enable bit */
-+#define SPI_STAT_ERRORS (SPI_STAT_ME | SPI_STAT_TE | SPI_STAT_RE | \
-+ SPI_STAT_AE | SPI_STAT_TUE | SPI_STAT_RUE)
-+
-+#define SPI_WHBSTATE_SETTUE BIT(15) /* Set transmit underflow error flag */
-+#define SPI_WHBSTATE_SETAE BIT(14) /* Set abort error flag */
-+#define SPI_WHBSTATE_SETRE BIT(13) /* Set receive error flag */
-+#define SPI_WHBSTATE_SETTE BIT(12) /* Set transmit error flag */
-+#define SPI_WHBSTATE_CLRTUE BIT(11) /* Clear transmit underflow error flag */
-+#define SPI_WHBSTATE_CLRAE BIT(10) /* Clear abort error flag */
-+#define SPI_WHBSTATE_CLRRE BIT(9) /* Clear receive error flag */
-+#define SPI_WHBSTATE_CLRTE BIT(8) /* Clear transmit error flag */
-+#define SPI_WHBSTATE_SETME BIT(7) /* Set mode error flag */
-+#define SPI_WHBSTATE_CLRME BIT(6) /* Clear mode error flag */
-+#define SPI_WHBSTATE_SETRUE BIT(5) /* Set receive underflow error flag */
-+#define SPI_WHBSTATE_CLRRUE BIT(4) /* Clear receive underflow error flag */
-+#define SPI_WHBSTATE_SETMS BIT(3) /* Set master select bit */
-+#define SPI_WHBSTATE_CLRMS BIT(2) /* Clear master select bit */
-+#define SPI_WHBSTATE_SETEN BIT(1) /* Set enable bit (operational mode) */
-+#define SPI_WHBSTATE_CLREN BIT(0) /* Clear enable bit (config mode */
-+#define SPI_WHBSTATE_CLR_ERRORS (SPI_WHBSTATE_CLRRUE | SPI_WHBSTATE_CLRME | \
-+ SPI_WHBSTATE_CLRTE | SPI_WHBSTATE_CLRRE | \
-+ SPI_WHBSTATE_CLRAE | SPI_WHBSTATE_CLRTUE)
-+
-+#define SPI_RXFCON_RXFITL_S 8 /* FIFO interrupt trigger level */
-+#define SPI_RXFCON_RXFITL_M (0x3F << SPI_RXFCON_RXFITL_S)
-+#define SPI_RXFCON_RXFLU BIT(1) /* FIFO flush */
-+#define SPI_RXFCON_RXFEN BIT(0) /* FIFO enable */
-+
-+#define SPI_TXFCON_TXFITL_S 8 /* FIFO interrupt trigger level */
-+#define SPI_TXFCON_TXFITL_M (0x3F << SPI_TXFCON_TXFITL_S)
-+#define SPI_TXFCON_TXFLU BIT(1) /* FIFO flush */
-+#define SPI_TXFCON_TXFEN BIT(0) /* FIFO enable */
-+
-+#define SPI_FSTAT_RXFFL_S 0
-+#define SPI_FSTAT_RXFFL_M (0x3f << SPI_FSTAT_RXFFL_S)
-+#define SPI_FSTAT_TXFFL_S 8
-+#define SPI_FSTAT_TXFFL_M (0x3f << SPI_FSTAT_TXFFL_S)
-+
-+#define SPI_GPOCON_ISCSBN_S 8
-+#define SPI_GPOCON_INVOUTN_S 0
-+
-+#define SPI_FGPO_SETOUTN_S 8
-+#define SPI_FGPO_CLROUTN_S 0
-+
-+#define SPI_RXREQ_RXCNT_M 0xFFFF /* Receive count value */
-+#define SPI_RXCNT_TODO_M 0xFFFF /* Recevie to-do value */
-+
-+#define SPI_IRNEN_TFI BIT(4) /* TX finished interrupt */
-+#define SPI_IRNEN_F BIT(3) /* Frame end interrupt request */
-+#define SPI_IRNEN_E BIT(2) /* Error end interrupt request */
-+#define SPI_IRNEN_T_XWAY BIT(1) /* Transmit end interrupt request */
-+#define SPI_IRNEN_R_XWAY BIT(0) /* Receive end interrupt request */
-+#define SPI_IRNEN_R_XRX BIT(1) /* Transmit end interrupt request */
-+#define SPI_IRNEN_T_XRX BIT(0) /* Receive end interrupt request */
-+#define SPI_IRNEN_ALL 0x1F
-+
-+struct lantiq_ssc_hwcfg {
-+ unsigned int irnen_r;
-+ unsigned int irnen_t;
-+};
-+
-+struct lantiq_ssc_spi {
-+ struct spi_master *master;
-+ struct device *dev;
-+ void __iomem *regbase;
-+ struct clk *spi_clk;
-+ struct clk *fpi_clk;
-+ const struct lantiq_ssc_hwcfg *hwcfg;
-+
-+ spinlock_t lock;
-+ struct workqueue_struct *wq;
-+ struct work_struct work;
-+
-+ const u8 *tx;
-+ u8 *rx;
-+ unsigned int tx_todo;
-+ unsigned int rx_todo;
-+ unsigned int bits_per_word;
-+ unsigned int speed_hz;
-+ unsigned int tx_fifo_size;
-+ unsigned int rx_fifo_size;
-+ unsigned int base_cs;
-+};
-+
-+static u32 lantiq_ssc_readl(const struct lantiq_ssc_spi *spi, u32 reg)
-+{
-+ return __raw_readl(spi->regbase + reg);
-+}
-+
-+static void lantiq_ssc_writel(const struct lantiq_ssc_spi *spi, u32 val,
-+ u32 reg)
-+{
-+ __raw_writel(val, spi->regbase + reg);
-+}
-+
-+static void lantiq_ssc_maskl(const struct lantiq_ssc_spi *spi, u32 clr,
-+ u32 set, u32 reg)
-+{
-+ u32 val = __raw_readl(spi->regbase + reg);
-+
-+ val &= ~clr;
-+ val |= set;
-+ __raw_writel(val, spi->regbase + reg);
-+}
-+
-+static unsigned int tx_fifo_level(const struct lantiq_ssc_spi *spi)
-+{
-+ u32 fstat = lantiq_ssc_readl(spi, SPI_FSTAT);
-+
-+ return (fstat & SPI_FSTAT_TXFFL_M) >> SPI_FSTAT_TXFFL_S;
-+}
-+
-+static unsigned int rx_fifo_level(const struct lantiq_ssc_spi *spi)
-+{
-+ u32 fstat = lantiq_ssc_readl(spi, SPI_FSTAT);
-+
-+ return fstat & SPI_FSTAT_RXFFL_M;
-+}
-+
-+static unsigned int tx_fifo_free(const struct lantiq_ssc_spi *spi)
-+{
-+ return spi->tx_fifo_size - tx_fifo_level(spi);
-+}
-+
-+static void rx_fifo_reset(const struct lantiq_ssc_spi *spi)
-+{
-+ u32 val = spi->rx_fifo_size << SPI_RXFCON_RXFITL_S;
-+
-+ val |= SPI_RXFCON_RXFEN | SPI_RXFCON_RXFLU;
-+ lantiq_ssc_writel(spi, val, SPI_RXFCON);
-+}
-+
-+static void tx_fifo_reset(const struct lantiq_ssc_spi *spi)
-+{
-+ u32 val = 1 << SPI_TXFCON_TXFITL_S;
-+
-+ val |= SPI_TXFCON_TXFEN | SPI_TXFCON_TXFLU;
-+ lantiq_ssc_writel(spi, val, SPI_TXFCON);
-+}
-+
-+static void rx_fifo_flush(const struct lantiq_ssc_spi *spi)
-+{
-+ lantiq_ssc_maskl(spi, 0, SPI_RXFCON_RXFLU, SPI_RXFCON);
-+}
-+
-+static void tx_fifo_flush(const struct lantiq_ssc_spi *spi)
-+{
-+ lantiq_ssc_maskl(spi, 0, SPI_TXFCON_TXFLU, SPI_TXFCON);
-+}
-+
-+static void hw_enter_config_mode(const struct lantiq_ssc_spi *spi)
-+{
-+ lantiq_ssc_writel(spi, SPI_WHBSTATE_CLREN, SPI_WHBSTATE);
-+}
-+
-+static void hw_enter_active_mode(const struct lantiq_ssc_spi *spi)
-+{
-+ lantiq_ssc_writel(spi, SPI_WHBSTATE_SETEN, SPI_WHBSTATE);
-+}
-+
-+static void hw_setup_speed_hz(const struct lantiq_ssc_spi *spi,
-+ unsigned int max_speed_hz)
-+{
-+ u32 spi_clk, brt;
-+
-+ /*
-+ * SPI module clock is derived from FPI bus clock dependent on
-+ * divider value in CLC.RMS which is always set to 1.
-+ *
-+ * f_SPI
-+ * baudrate = --------------
-+ * 2 * (BR + 1)
-+ */
-+ spi_clk = clk_get_rate(spi->fpi_clk) / 2;
-+
-+ if (max_speed_hz > spi_clk)
-+ brt = 0;
-+ else
-+ brt = spi_clk / max_speed_hz - 1;
-+
-+ if (brt > 0xFFFF)
-+ brt = 0xFFFF;
-+
-+ dev_dbg(spi->dev, "spi_clk %u, max_speed_hz %u, brt %u\n",
-+ spi_clk, max_speed_hz, brt);
-+
-+ lantiq_ssc_writel(spi, brt, SPI_BRT);
-+}
-+
-+static void hw_setup_bits_per_word(const struct lantiq_ssc_spi *spi,
-+ unsigned int bits_per_word)
-+{
-+ u32 bm;
-+
-+ /* CON.BM value = bits_per_word - 1 */
-+ bm = (bits_per_word - 1) << SPI_CON_BM_S;
-+
-+ lantiq_ssc_maskl(spi, SPI_CON_BM_M, bm, SPI_CON);
-+}
-+
-+static void hw_setup_clock_mode(const struct lantiq_ssc_spi *spi,
-+ unsigned int mode)
-+{
-+ u32 con_set = 0, con_clr = 0;
-+
-+ /*
-+ * SPI mode mapping in CON register:
-+ * Mode CPOL CPHA CON.PO CON.PH
-+ * 0 0 0 0 1
-+ * 1 0 1 0 0
-+ * 2 1 0 1 1
-+ * 3 1 1 1 0
-+ */
-+ if (mode & SPI_CPHA)
-+ con_clr |= SPI_CON_PH;
-+ else
-+ con_set |= SPI_CON_PH;
-+
-+ if (mode & SPI_CPOL)
-+ con_set |= SPI_CON_PO | SPI_CON_IDLE;
-+ else
-+ con_clr |= SPI_CON_PO | SPI_CON_IDLE;
-+
-+ /* Set heading control */
-+ if (mode & SPI_LSB_FIRST)
-+ con_clr |= SPI_CON_HB;
-+ else
-+ con_set |= SPI_CON_HB;
-+
-+ /* Set loopback mode */
-+ if (mode & SPI_LOOP)
-+ con_set |= SPI_CON_LB;
-+ else
-+ con_clr |= SPI_CON_LB;
-+
-+ lantiq_ssc_maskl(spi, con_clr, con_set, SPI_CON);
-+}
-+
-+static void lantiq_ssc_hw_init(const struct lantiq_ssc_spi *spi)
-+{
-+ const struct lantiq_ssc_hwcfg *hwcfg = spi->hwcfg;
-+
-+ /*
-+ * Set clock divider for run mode to 1 to
-+ * run at same frequency as FPI bus
-+ */
-+ lantiq_ssc_writel(spi, 1 << SPI_CLC_RMC_S, SPI_CLC);
-+
-+ /* Put controller into config mode */
-+ hw_enter_config_mode(spi);
-+
-+ /* Clear error flags */
-+ lantiq_ssc_maskl(spi, 0, SPI_WHBSTATE_CLR_ERRORS, SPI_WHBSTATE);
-+
-+ /* Enable error checking, disable TX/RX */
-+ lantiq_ssc_writel(spi, SPI_CON_RUEN | SPI_CON_AEN | SPI_CON_TEN |
-+ SPI_CON_REN | SPI_CON_TXOFF | SPI_CON_RXOFF, SPI_CON);
-+
-+ /* Setup default SPI mode */
-+ hw_setup_bits_per_word(spi, spi->bits_per_word);
-+ hw_setup_clock_mode(spi, SPI_MODE_0);
-+
-+ /* Enable master mode and clear error flags */
-+ lantiq_ssc_writel(spi, SPI_WHBSTATE_SETMS | SPI_WHBSTATE_CLR_ERRORS,
-+ SPI_WHBSTATE);
-+
-+ /* Reset GPIO/CS registers */
-+ lantiq_ssc_writel(spi, 0, SPI_GPOCON);
-+ lantiq_ssc_writel(spi, 0xFF00, SPI_FPGO);
-+
-+ /* Enable and flush FIFOs */
-+ rx_fifo_reset(spi);
-+ tx_fifo_reset(spi);
-+
-+ /* Enable interrupts */
-+ lantiq_ssc_writel(spi, hwcfg->irnen_t | hwcfg->irnen_r | SPI_IRNEN_E,
-+ SPI_IRNEN);
-+}
-+
-+static int lantiq_ssc_setup(struct spi_device *spidev)
-+{
-+ struct spi_master *master = spidev->master;
-+ struct lantiq_ssc_spi *spi = spi_master_get_devdata(master);
-+ unsigned int cs = spidev->chip_select;
-+ u32 gpocon;
-+
-+ /* GPIOs are used for CS */
-+ if (gpio_is_valid(spidev->cs_gpio))
-+ return 0;
-+
-+ dev_dbg(spi->dev, "using internal chipselect %u\n", cs);
-+
-+ if (cs < spi->base_cs) {
-+ dev_err(spi->dev,
-+ "chipselect %i too small (min %i)\n", cs, spi->base_cs);
-+ return -EINVAL;
-+ }
-+
-+ /* set GPO pin to CS mode */
-+ gpocon = 1 << ((cs - spi->base_cs) + SPI_GPOCON_ISCSBN_S);
-+
-+ /* invert GPO pin */
-+ if (spidev->mode & SPI_CS_HIGH)
-+ gpocon |= 1 << (cs - spi->base_cs);
-+
-+ lantiq_ssc_maskl(spi, 0, gpocon, SPI_GPOCON);
-+
-+ return 0;
-+}
-+
-+static int lantiq_ssc_prepare_message(struct spi_master *master,
-+ struct spi_message *message)
-+{
-+ struct lantiq_ssc_spi *spi = spi_master_get_devdata(master);
-+
-+ hw_enter_config_mode(spi);
-+ hw_setup_clock_mode(spi, message->spi->mode);
-+ hw_enter_active_mode(spi);
-+
-+ return 0;
-+}
-+
-+static void hw_setup_transfer(struct lantiq_ssc_spi *spi,
-+ struct spi_device *spidev, struct spi_transfer *t)
-+{
-+ unsigned int speed_hz = t->speed_hz;
-+ unsigned int bits_per_word = t->bits_per_word;
-+ u32 con;
-+
-+ if (bits_per_word != spi->bits_per_word ||
-+ speed_hz != spi->speed_hz) {
-+ hw_enter_config_mode(spi);
-+ hw_setup_speed_hz(spi, speed_hz);
-+ hw_setup_bits_per_word(spi, bits_per_word);
-+ hw_enter_active_mode(spi);
-+
-+ spi->speed_hz = speed_hz;
-+ spi->bits_per_word = bits_per_word;
-+ }
-+
-+ /* Configure transmitter and receiver */
-+ con = lantiq_ssc_readl(spi, SPI_CON);
-+ if (t->tx_buf)
-+ con &= ~SPI_CON_TXOFF;
-+ else
-+ con |= SPI_CON_TXOFF;
-+
-+ if (t->rx_buf)
-+ con &= ~SPI_CON_RXOFF;
-+ else
-+ con |= SPI_CON_RXOFF;
-+
-+ lantiq_ssc_writel(spi, con, SPI_CON);
-+}
-+
-+static int lantiq_ssc_unprepare_message(struct spi_master *master,
-+ struct spi_message *message)
-+{
-+ struct lantiq_ssc_spi *spi = spi_master_get_devdata(master);
-+
-+ flush_workqueue(spi->wq);
-+
-+ /* Disable transmitter and receiver while idle */
-+ lantiq_ssc_maskl(spi, 0, SPI_CON_TXOFF | SPI_CON_RXOFF, SPI_CON);
-+
-+ return 0;
-+}
-+
-+static void tx_fifo_write(struct lantiq_ssc_spi *spi)
-+{
-+ const u8 *tx8;
-+ const u16 *tx16;
-+ const u32 *tx32;
-+ u32 data;
-+ unsigned int tx_free = tx_fifo_free(spi);
-+
-+ while (spi->tx_todo && tx_free) {
-+ switch (spi->bits_per_word) {
-+ case 2 ... 8:
-+ tx8 = spi->tx;
-+ data = *tx8;
-+ spi->tx_todo--;
-+ spi->tx++;
-+ break;
-+ case 16:
-+ tx16 = (u16 *) spi->tx;
-+ data = *tx16;
-+ spi->tx_todo -= 2;
-+ spi->tx += 2;
-+ break;
-+ case 32:
-+ tx32 = (u32 *) spi->tx;
-+ data = *tx32;
-+ spi->tx_todo -= 4;
-+ spi->tx += 4;
-+ break;
-+ default:
-+ WARN_ON(1);
-+ data = 0;
-+ break;
-+ }
-+
-+ lantiq_ssc_writel(spi, data, SPI_TB);
-+ tx_free--;
-+ }
-+}
-+
-+static void rx_fifo_read_full_duplex(struct lantiq_ssc_spi *spi)
-+{
-+ u8 *rx8;
-+ u16 *rx16;
-+ u32 *rx32;
-+ u32 data;
-+ unsigned int rx_fill = rx_fifo_level(spi);
-+
-+ while (rx_fill) {
-+ data = lantiq_ssc_readl(spi, SPI_RB);
-+
-+ switch (spi->bits_per_word) {
-+ case 2 ... 8:
-+ rx8 = spi->rx;
-+ *rx8 = data;
-+ spi->rx_todo--;
-+ spi->rx++;
-+ break;
-+ case 16:
-+ rx16 = (u16 *) spi->rx;
-+ *rx16 = data;
-+ spi->rx_todo -= 2;
-+ spi->rx += 2;
-+ break;
-+ case 32:
-+ rx32 = (u32 *) spi->rx;
-+ *rx32 = data;
-+ spi->rx_todo -= 4;
-+ spi->rx += 4;
-+ break;
-+ default:
-+ WARN_ON(1);
-+ break;
-+ }
-+
-+ rx_fill--;
-+ }
-+}
-+
-+static void rx_fifo_read_half_duplex(struct lantiq_ssc_spi *spi)
-+{
-+ u32 data, *rx32;
-+ u8 *rx8;
-+ unsigned int rxbv, shift;
-+ unsigned int rx_fill = rx_fifo_level(spi);
-+
-+ /*
-+ * In RX-only mode the bits per word value is ignored by HW. A value
-+ * of 32 is used instead. Thus all 4 bytes per FIFO must be read.
-+ * If remaining RX bytes are less than 4, the FIFO must be read
-+ * differently. The amount of received and valid bytes is indicated
-+ * by STAT.RXBV register value.
-+ */
-+ while (rx_fill) {
-+ if (spi->rx_todo < 4) {
-+ rxbv = (lantiq_ssc_readl(spi, SPI_STAT) &
-+ SPI_STAT_RXBV_M) >> SPI_STAT_RXBV_S;
-+ data = lantiq_ssc_readl(spi, SPI_RB);
-+
-+ shift = (rxbv - 1) * 8;
-+ rx8 = spi->rx;
-+
-+ while (rxbv) {
-+ *rx8++ = (data >> shift) & 0xFF;
-+ rxbv--;
-+ shift -= 8;
-+ spi->rx_todo--;
-+ spi->rx++;
-+ }
-+ } else {
-+ data = lantiq_ssc_readl(spi, SPI_RB);
-+ rx32 = (u32 *) spi->rx;
-+
-+ *rx32++ = data;
-+ spi->rx_todo -= 4;
-+ spi->rx += 4;
-+ }
-+ rx_fill--;
-+ }
-+}
-+
-+static void rx_request(struct lantiq_ssc_spi *spi)
-+{
-+ unsigned int rxreq, rxreq_max;
-+
-+ /*
-+ * To avoid receive overflows at high clocks it is better to request
-+ * only the amount of bytes that fits into all FIFOs. This value
-+ * depends on the FIFO size implemented in hardware.
-+ */
-+ rxreq = spi->rx_todo;
-+ rxreq_max = spi->rx_fifo_size * 4;
-+ if (rxreq > rxreq_max)
-+ rxreq = rxreq_max;
-+
-+ lantiq_ssc_writel(spi, rxreq, SPI_RXREQ);
-+}
-+
-+static irqreturn_t lantiq_ssc_xmit_interrupt(int irq, void *data)
-+{
-+ struct lantiq_ssc_spi *spi = data;
-+
-+ if (spi->tx) {
-+ if (spi->rx && spi->rx_todo)
-+ rx_fifo_read_full_duplex(spi);
-+
-+ if (spi->tx_todo)
-+ tx_fifo_write(spi);
-+ else if (!tx_fifo_level(spi))
-+ goto completed;
-+ } else if (spi->rx) {
-+ if (spi->rx_todo) {
-+ rx_fifo_read_half_duplex(spi);
-+
-+ if (spi->rx_todo)
-+ rx_request(spi);
-+ else
-+ goto completed;
-+ } else {
-+ goto completed;
-+ }
-+ }
-+
-+ return IRQ_HANDLED;
-+
-+completed:
-+ queue_work(spi->wq, &spi->work);
-+
-+ return IRQ_HANDLED;
-+}
-+
-+static irqreturn_t lantiq_ssc_err_interrupt(int irq, void *data)
-+{
-+ struct lantiq_ssc_spi *spi = data;
-+ u32 stat = lantiq_ssc_readl(spi, SPI_STAT);
-+
-+ if (!(stat & SPI_STAT_ERRORS))
-+ return IRQ_NONE;
-+
-+ if (stat & SPI_STAT_RUE)
-+ dev_err(spi->dev, "receive underflow error\n");
-+ if (stat & SPI_STAT_TUE)
-+ dev_err(spi->dev, "transmit underflow error\n");
-+ if (stat & SPI_STAT_AE)
-+ dev_err(spi->dev, "abort error\n");
-+ if (stat & SPI_STAT_RE)
-+ dev_err(spi->dev, "receive overflow error\n");
-+ if (stat & SPI_STAT_TE)
-+ dev_err(spi->dev, "transmit overflow error\n");
-+ if (stat & SPI_STAT_ME)
-+ dev_err(spi->dev, "mode error\n");
-+
-+ /* Clear error flags */
-+ lantiq_ssc_maskl(spi, 0, SPI_WHBSTATE_CLR_ERRORS, SPI_WHBSTATE);
-+
-+ /* set bad status so it can be retried */
-+ if (spi->master->cur_msg)
-+ spi->master->cur_msg->status = -EIO;
-+ queue_work(spi->wq, &spi->work);
-+
-+ return IRQ_HANDLED;
-+}
-+
-+static int transfer_start(struct lantiq_ssc_spi *spi, struct spi_device *spidev,
-+ struct spi_transfer *t)
-+{
-+ unsigned long flags;
-+
-+ spin_lock_irqsave(&spi->lock, flags);
-+
-+ spi->tx = t->tx_buf;
-+ spi->rx = t->rx_buf;
-+
-+ if (t->tx_buf) {
-+ spi->tx_todo = t->len;
-+
-+ /* initially fill TX FIFO */
-+ tx_fifo_write(spi);
-+ }
-+
-+ if (spi->rx) {
-+ spi->rx_todo = t->len;
-+
-+ /* start shift clock in RX-only mode */
-+ if (!spi->tx)
-+ rx_request(spi);
-+ }
-+
-+ spin_unlock_irqrestore(&spi->lock, flags);
-+
-+ return t->len;
-+}
-+
-+/*
-+ * The driver only gets an interrupt when the FIFO is empty, but there
-+ * is an additional shift register from which the data is written to
-+ * the wire. We get the last interrupt when the controller starts to
-+ * write the last word to the wire, not when it is finished. Do busy
-+ * waiting till it finishes.
-+ */
-+static void lantiq_ssc_bussy_work(struct work_struct *work)
-+{
-+ struct lantiq_ssc_spi *spi;
-+ unsigned long long timeout = 8LL * 1000LL;
-+ unsigned long end;
-+
-+ spi = container_of(work, typeof(*spi), work);
-+
-+ do_div(timeout, spi->speed_hz);
-+ timeout += timeout + 100; /* some tolerance */
-+
-+ end = jiffies + msecs_to_jiffies(timeout);
-+ do {
-+ u32 stat = lantiq_ssc_readl(spi, SPI_STAT);
-+
-+ if (!(stat & SPI_STAT_BSY)) {
-+ spi_finalize_current_transfer(spi->master);
-+ return;
-+ }
-+
-+ cond_resched();
-+ } while (!time_after_eq(jiffies, end));
-+
-+ if (spi->master->cur_msg)
-+ spi->master->cur_msg->status = -EIO;
-+ spi_finalize_current_transfer(spi->master);
-+}
-+
-+static void lantiq_ssc_handle_err(struct spi_master *master,
-+ struct spi_message *message)
-+{
-+ struct lantiq_ssc_spi *spi = spi_master_get_devdata(master);
-+
-+ /* flush FIFOs on timeout */
-+ rx_fifo_flush(spi);
-+ tx_fifo_flush(spi);
-+}
-+
-+static void lantiq_ssc_set_cs(struct spi_device *spidev, bool enable)
-+{
-+ struct lantiq_ssc_spi *spi = spi_master_get_devdata(spidev->master);
-+ unsigned int cs = spidev->chip_select;
-+ u32 fgpo;
-+
-+ if (!!(spidev->mode & SPI_CS_HIGH) == enable)
-+ fgpo = (1 << (cs - spi->base_cs));
-+ else
-+ fgpo = (1 << (cs - spi->base_cs + SPI_FGPO_SETOUTN_S));
-+
-+ lantiq_ssc_writel(spi, fgpo, SPI_FPGO);
-+}
-+
-+static int lantiq_ssc_transfer_one(struct spi_master *master,
-+ struct spi_device *spidev,
-+ struct spi_transfer *t)
-+{
-+ struct lantiq_ssc_spi *spi = spi_master_get_devdata(master);
-+
-+ hw_setup_transfer(spi, spidev, t);
-+
-+ return transfer_start(spi, spidev, t);
-+}
-+
-+static const struct lantiq_ssc_hwcfg lantiq_ssc_xway = {
-+ .irnen_r = SPI_IRNEN_R_XWAY,
-+ .irnen_t = SPI_IRNEN_T_XWAY,
-+};
-+
-+static const struct lantiq_ssc_hwcfg lantiq_ssc_xrx = {
-+ .irnen_r = SPI_IRNEN_R_XRX,
-+ .irnen_t = SPI_IRNEN_T_XRX,
-+};
-+
-+static const struct of_device_id lantiq_ssc_match[] = {
-+ { .compatible = "lantiq,ase-spi", .data = &lantiq_ssc_xway, },
-+ { .compatible = "lantiq,falcon-spi", .data = &lantiq_ssc_xrx, },
-+ { .compatible = "lantiq,xrx100-spi", .data = &lantiq_ssc_xrx, },
-+ {},
-+};
-+MODULE_DEVICE_TABLE(of, lantiq_ssc_match);
-+
-+static int lantiq_ssc_probe(struct platform_device *pdev)
-+{
-+ struct device *dev = &pdev->dev;
-+ struct spi_master *master;
-+ struct resource *res;
-+ struct lantiq_ssc_spi *spi;
-+ const struct lantiq_ssc_hwcfg *hwcfg;
-+ const struct of_device_id *match;
-+ int err, rx_irq, tx_irq, err_irq;
-+ u32 id, supports_dma, revision;
-+ unsigned int num_cs;
-+
-+ match = of_match_device(lantiq_ssc_match, dev);
-+ if (!match) {
-+ dev_err(dev, "no device match\n");
-+ return -EINVAL;
-+ }
-+ hwcfg = match->data;
-+
-+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-+ if (!res) {
-+ dev_err(dev, "failed to get resources\n");
-+ return -ENXIO;
-+ }
-+
-+ rx_irq = platform_get_irq_byname(pdev, SPI_RX_IRQ_NAME);
-+ if (rx_irq < 0) {
-+ dev_err(dev, "failed to get %s\n", SPI_RX_IRQ_NAME);
-+ return -ENXIO;
-+ }
-+
-+ tx_irq = platform_get_irq_byname(pdev, SPI_TX_IRQ_NAME);
-+ if (tx_irq < 0) {
-+ dev_err(dev, "failed to get %s\n", SPI_TX_IRQ_NAME);
-+ return -ENXIO;
-+ }
-+
-+ err_irq = platform_get_irq_byname(pdev, SPI_ERR_IRQ_NAME);
-+ if (err_irq < 0) {
-+ dev_err(dev, "failed to get %s\n", SPI_ERR_IRQ_NAME);
-+ return -ENXIO;
-+ }
-+
-+ master = spi_alloc_master(dev, sizeof(struct lantiq_ssc_spi));
-+ if (!master)
-+ return -ENOMEM;
-+
-+ spi = spi_master_get_devdata(master);
-+ spi->master = master;
-+ spi->dev = dev;
-+ spi->hwcfg = hwcfg;
-+ platform_set_drvdata(pdev, spi);
-+
-+ spi->regbase = devm_ioremap_resource(dev, res);
-+ if (IS_ERR(spi->regbase)) {
-+ err = PTR_ERR(spi->regbase);
-+ goto err_master_put;
-+ }
-+
-+ err = devm_request_irq(dev, rx_irq, lantiq_ssc_xmit_interrupt,
-+ 0, SPI_RX_IRQ_NAME, spi);
-+ if (err)
-+ goto err_master_put;
-+
-+ err = devm_request_irq(dev, tx_irq, lantiq_ssc_xmit_interrupt,
-+ 0, SPI_TX_IRQ_NAME, spi);
-+ if (err)
-+ goto err_master_put;
-+
-+ err = devm_request_irq(dev, err_irq, lantiq_ssc_err_interrupt,
-+ 0, SPI_ERR_IRQ_NAME, spi);
-+ if (err)
-+ goto err_master_put;
-+
-+ spi->spi_clk = devm_clk_get(dev, "gate");
-+ if (IS_ERR(spi->spi_clk)) {
-+ err = PTR_ERR(spi->spi_clk);
-+ goto err_master_put;
-+ }
-+ err = clk_prepare_enable(spi->spi_clk);
-+ if (err)
-+ goto err_master_put;
-+
-+ /*
-+ * Use the old clk_get_fpi() function on Lantiq platform, till it
-+ * supports common clk.
-+ */
-+#if defined(CONFIG_LANTIQ) && !defined(CONFIG_COMMON_CLK)
-+ spi->fpi_clk = clk_get_fpi();
-+#else
-+ spi->fpi_clk = clk_get(dev, "freq");
-+#endif
-+ if (IS_ERR(spi->fpi_clk)) {
-+ err = PTR_ERR(spi->fpi_clk);
-+ goto err_clk_disable;
-+ }
-+
-+ num_cs = 8;
-+ of_property_read_u32(pdev->dev.of_node, "num-cs", &num_cs);
-+
-+ spi->base_cs = 1;
-+ of_property_read_u32(pdev->dev.of_node, "base-cs", &spi->base_cs);
-+
-+ spin_lock_init(&spi->lock);
-+ spi->bits_per_word = 8;
-+ spi->speed_hz = 0;
-+
-+ master->dev.of_node = pdev->dev.of_node;
-+ master->num_chipselect = num_cs;
-+ master->setup = lantiq_ssc_setup;
-+ master->set_cs = lantiq_ssc_set_cs;
-+ master->handle_err = lantiq_ssc_handle_err;
-+ master->prepare_message = lantiq_ssc_prepare_message;
-+ master->unprepare_message = lantiq_ssc_unprepare_message;
-+ master->transfer_one = lantiq_ssc_transfer_one;
-+ master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_LSB_FIRST | SPI_CS_HIGH |
-+ SPI_LOOP;
-+ master->bits_per_word_mask = SPI_BPW_RANGE_MASK(2, 8) |
-+ SPI_BPW_MASK(16) | SPI_BPW_MASK(32);
-+
-+ spi->wq = alloc_ordered_workqueue(dev_name(dev), 0);
-+ if (!spi->wq) {
-+ err = -ENOMEM;
-+ goto err_clk_put;
-+ }
-+ INIT_WORK(&spi->work, lantiq_ssc_bussy_work);
-+
-+ id = lantiq_ssc_readl(spi, SPI_ID);
-+ spi->tx_fifo_size = (id & SPI_ID_TXFS_M) >> SPI_ID_TXFS_S;
-+ spi->rx_fifo_size = (id & SPI_ID_RXFS_M) >> SPI_ID_RXFS_S;
-+ supports_dma = (id & SPI_ID_CFG_M) >> SPI_ID_CFG_S;
-+ revision = id & SPI_ID_REV_M;
-+
-+ lantiq_ssc_hw_init(spi);
-+
-+ dev_info(dev,
-+ "Lantiq SSC SPI controller (Rev %i, TXFS %u, RXFS %u, DMA %u)\n",
-+ revision, spi->tx_fifo_size, spi->rx_fifo_size, supports_dma);
-+
-+ err = devm_spi_register_master(dev, master);
-+ if (err) {
-+ dev_err(dev, "failed to register spi_master\n");
-+ goto err_wq_destroy;
-+ }
-+
-+ return 0;
-+
-+err_wq_destroy:
-+ destroy_workqueue(spi->wq);
-+err_clk_put:
-+ clk_put(spi->fpi_clk);
-+err_clk_disable:
-+ clk_disable_unprepare(spi->spi_clk);
-+err_master_put:
-+ spi_master_put(master);
-+
-+ return err;
-+}
-+
-+static int lantiq_ssc_remove(struct platform_device *pdev)
-+{
-+ struct lantiq_ssc_spi *spi = platform_get_drvdata(pdev);
-+
-+ lantiq_ssc_writel(spi, 0, SPI_IRNEN);
-+ lantiq_ssc_writel(spi, 0, SPI_CLC);
-+ rx_fifo_flush(spi);
-+ tx_fifo_flush(spi);
-+ hw_enter_config_mode(spi);
-+
-+ destroy_workqueue(spi->wq);
-+ clk_disable_unprepare(spi->spi_clk);
-+ clk_put(spi->fpi_clk);
-+
-+ return 0;
-+}
-+
-+static struct platform_driver lantiq_ssc_driver = {
-+ .probe = lantiq_ssc_probe,
-+ .remove = lantiq_ssc_remove,
-+ .driver = {
-+ .name = "spi-lantiq-ssc",
-+ .owner = THIS_MODULE,
-+ .of_match_table = lantiq_ssc_match,
-+ },
-+};
-+module_platform_driver(lantiq_ssc_driver);
-+
-+MODULE_DESCRIPTION("Lantiq SSC SPI controller driver");
-+MODULE_AUTHOR("Daniel Schwierzeck <daniel.schwierzeck@gmail.com>");
-+MODULE_AUTHOR("Hauke Mehrtens <hauke@hauke-m.de>");
-+MODULE_LICENSE("GPL");
-+MODULE_ALIAS("platform:spi-lantiq-ssc");
generated by cgit v1.1 at 2025-02-17 23:24:38 +0000